Re: [patch] pg_copy - a command for reliable WAL archiving

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Greg Stark
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Re: [patch] pg_copy - a command for reliable WAL archiving
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CAM-w4HNQNE7+G4gR=4BbwqarBk2aKgVAXyR-RV+cwD1Hq+mTjg@mail.gmail.com
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Re: [patch] pg_copy - a command for reliable WAL archiving (Alvaro Herrera)
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[patch] pg_copy - a command for reliable WAL archiving "MauMau" <maumau307@gmail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Abhijit Menon-Sen <ams@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Joe Conway <mail@joeconway.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Abhijit Menon-Sen <ams@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving "MauMau" <maumau307@gmail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving "MauMau" <maumau307@gmail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Fujii Masao <masao.fujii@gmail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Kevin Grittner <kgrittn@ymail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving "MauMau" <maumau307@gmail.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Alvaro Herrera <alvherre@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Andres Freund <andres@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Alvaro Herrera <alvherre@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Andres Freund <andres@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Tom Lane <tgl@sss.pgh.pa.us>
Re: [patch] pg_copy - a command for reliable WAL archiving Andres Freund <andres@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Tom Lane <tgl@sss.pgh.pa.us>
Re: [patch] pg_copy - a command for reliable WAL archiving Bruce Momjian <bruce@momjian.us>
Re: [patch] pg_copy - a command for reliable WAL archiving Andres Freund <andres@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Greg Stark <stark@mit.edu>
Re: [patch] pg_copy - a command for reliable WAL archiving Greg Stark <stark@mit.edu>
Re: [patch] pg_copy - a command for reliable WAL archiving Alvaro Herrera <alvherre@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Greg Stark <stark@mit.edu>
Re: [patch] pg_copy - a command for reliable WAL archiving Alvaro Herrera <alvherre@2ndquadrant.com>
Re: [patch] pg_copy - a command for reliable WAL archiving Peter Eisentraut <peter_e@gmx.net>
Re: [patch] pg_copy - a command for reliable WAL archiving Peter Eisentraut <peter_e@gmx.net> 
On Wed, Aug 20, 2014 at 2:27 PM, Alvaro Herrera
 wrote:
> Hmm, the real trick here is linkat(... "/proc/self/foobar"), not the
> O_TMPFILE: you can have an open file descriptor to an "invisible" file
> simply by creating a normal file and unlinking it.  I looked at linkat()
> yesterday but the idea of using /proc/self didn't occur to me.  Nasty
> trick :-(  It seems linkat() is quite a bit more portable than
> O_TMPFILE, fortunately ...

Supposedly linkat(2) on Linux refuses to create a link to a file that
was opened normally and had its last link removed with unlink(2) due
to concerns that this would create security holes.


-- 
greg
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